/*
 * Javassist, a Java-bytecode translator toolkit.
 * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License.  Alternatively, the contents of this file may be used under
 * the terms of the GNU Lesser General Public License Version 2.1 or later,
 * or the Apache License Version 2.0.
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 */

package com.feilong.lib.javassist;

import java.io.DataOutputStream;
import java.io.IOException;

import com.feilong.lib.javassist.bytecode.ClassFile;

class CtNewClass extends CtClassType{

    /*
     * true if the class is an interface.
     */
    protected boolean hasConstructor;

    CtNewClass(String name, ClassPool cp, boolean isInterface, CtClass superclass){
        super(name, cp);
        wasChanged = true;
        String superName;
        if (isInterface || superclass == null){
            superName = null;
        }else{
            superName = superclass.getName();
        }

        classfile = new ClassFile(isInterface, name, superName);
        if (isInterface && superclass != null){
            classfile.setInterfaces(new String[] { superclass.getName() });
        }

        setModifiers(Modifier.setPublic(getModifiers()));
        hasConstructor = isInterface;
    }

    @Override
    protected void extendToString(StringBuffer buffer){
        if (hasConstructor){
            buffer.append("hasConstructor ");
        }

        super.extendToString(buffer);
    }

    @Override
    public void addConstructor(CtConstructor c) throws CannotCompileException{
        hasConstructor = true;
        super.addConstructor(c);
    }

    @Override
    public void toBytecode(DataOutputStream out) throws CannotCompileException,IOException{
        if (!hasConstructor){
            try{
                inheritAllConstructors();
                hasConstructor = true;
            }catch (NotFoundException e){
                throw new CannotCompileException(e);
            }
        }

        super.toBytecode(out);
    }

    /**
     * Adds constructors inhrited from the super class.
     *
     * <p>
     * After this method is called, the class inherits all the
     * constructors from the super class. The added constructor
     * calls the super's constructor with the same signature.
     */
    public void inheritAllConstructors() throws CannotCompileException,NotFoundException{
        CtClass superclazz;
        CtConstructor[] cs;

        superclazz = getSuperclass();
        cs = superclazz.getDeclaredConstructors();

        int n = 0;
        for (CtConstructor c : cs){
            int mod = c.getModifiers();
            if (isInheritable(mod, superclazz)){
                CtConstructor cons = CtNewConstructor.make(c.getParameterTypes(), c.getExceptionTypes(), this);
                cons.setModifiers(mod & (Modifier.PUBLIC | Modifier.PROTECTED | Modifier.PRIVATE));
                addConstructor(cons);
                ++n;
            }
        }

        if (n < 1){
            throw new CannotCompileException("no inheritable constructor in " + superclazz.getName());
        }

    }

    private boolean isInheritable(int mod,CtClass superclazz){
        if (Modifier.isPrivate(mod)){
            return false;
        }

        if (Modifier.isPackage(mod)){
            String pname = getPackageName();
            String pname2 = superclazz.getPackageName();
            if (pname == null){
                return pname2 == null;
            }
            return pname.equals(pname2);
        }

        return true;
    }
}
